Bell ringer transformation

Triangle STU is rotated 270 degrees counter clockwise about the origin to create triangle S'T'U'. If point U of triangle STU is (a,b), which algebraic expression best describes U' of S'T'U'

• a-270, b-270

• a, -b

• b, a

• b, -a

If triangle STU is rotated 90° counterclockwise about the origin to create triangle S’T’U’, which statement about the figures would be true?

• The orientation of the figure will be the same, and the figures will be congruent.

• The orientation of the figure will not be the same.

• The figures will not be congruent.

• Both the orientation of the vertices and the orientation of the figure will be the same.

The triangle shown on the coordinate grid is rotated 90° counter-clockwise about the origin.

Which would be the measure of an angle of the resulting triangle?

• 30°

• 45°

• 60°

• 75°